[PATCH v2 08/11] Documentation: phy: Let the rockchip eMMC PHY get an exported card clock

[Rob Herring]

On Mon, Jun 13, 2016 at 04:04:32PM -0700, Douglas Anderson wrote:
> As of an earlier change in this series ("Documentation: mmc:
> sdhci-of-arasan: Add ability to export card clock") the SDHCI driver
> used on Rockchip SoCs can now expose its clock.  Let's now specify that
> the PHY can use it.
> 
> Letting the PHY get access to this clock means it can adjust
> phyctrl_frqsel field appropriately.  Although the Rockchip PHY appears
> slightly different than the reference Arasan one, you can see that the
> Arasan datasheet [1] had it defined as:
>   Select the frequency range of DLL operation:
>   3b'000 => 200MHz to 170 MHz
>   3b'001 => 170MHz to 140 MHz
>   3b'010 => 140MHz to 110 MHz
>   3b'011 => 110MHz to 80MHz
>   3b'100 => 80MHz to 50 MHz
>   3b'101 => 275Mhz to 250MHz
>   3b'110 => 250MHz to 225MHz
>   3b'111 => 225MHz to 200MHz
> 
> On the Rockchip version of the PHY we have less granularity but the idea
> is the same.
> 
> [1]: https://arasan.com/wp-content/media/eMMC-5-1-Total-Solution_Rev-1-3.pdf
> 
> Signed-off-by: Douglas Anderson <dianders at chromium.org>
> ---
> Changes in v2:
> - List out clocks and clock names (Rob)
> 
>  Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt | 9 +++++++++
>  1 file changed, 9 insertions(+)

Acked-by: Rob Herring <robh at kernel.org>